Planar antenna

Abstract

The present invention provides a wireless transmit / receive unit, comprising a feeding connecting line, a first radiating line, a second radiating line, a third radiating line and a fourth radiating line, wherein the third radiating line is longer than the first radiating line and the first radiating line is longer than the second radiating line that provides different current paths for getting a broader bandwidth. The first, second and third radiating lines are connected parallel for enhancing an antenna pattern being perpendicular thereto, and form a series capacity between the first and the third radiating lines. The fourth radiating line vertically connects between the third radiating line and a grounding line for forming a grounding capacity. The printed antenna can be reduced in size by the effect of the two capacities. The wireless transmit / receive unit can provide a better isolation with others by the direction enforced pattern and the reduced size.

Description

FIELD OF THE INVENTIONThe present invention relates to a planar antenna, and more particular to the planar antenna used for the multiple antenna transmitting devices.BACKGROUND OF THE INVENTIONThe conventional wireless transmitting deices have to mount antenna in the front end thereof for transmitting and receiving. In general wireless transmitting deices, the use of the front antennas are depended on the inside space, the features and the cost thereof. So far, the antennas used on the wireless transmitting devices can be sorted by the band width, such as the single band, the dual band, the multiple band and the wild band antenna . . . etc. Otherwise, the antennas can also be divided to two groups by the material, one is chip antenna and the other is printed antenna; wherein the chip antenna has the features of the smaller area, the high cost and the narrower band width. The printed antenna can further be sorted by the structure, such as the monopole, the dipole, the PIFA and the ci...

AI Technical Summary

Benefits of technology

The solution achieves reduced antenna size, increased bandwidth, and improved isolation between antennas, enhancing the efficiency and cost-effectiveness of wireless transmitting / receiving units while maintaining directional radiation.

Problems solved by technology

However, the existing chip antennas and printed antennas are all not able to satisfy the requirements of the multiple antennas operation mode, for example, the chip antennas have the advantages of the small area and the good isolation, but also have the defects of the narrow band and the high cost; and the printed antennas have the advantages of the wild band and the low cost, but also have the defects of the big area and bad isolation.

However, such processing methods do not really solve the problem, i.e. the data feedback is still existing, and just no bother through the methods, and cost for the software is also high.

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